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xi                                  ERYMANTHINE BOAR                               279
Dicotylidae, contains but one genus? Uicotryles, with at most two
species. The name of the animal is connected with the dorsal
gland; the animal thus appeared to possess two navels. The
Peccaries, exclusively confined to the New "World, differ from
the Old-World Pigs in one or more important characters. They
have only three toes on the hind-feet, and the stomach is com-
plicated. Though the Peccaries have but small tusks they hunt
in packs and are very dangerous animals to meet with. They
owe, too, their safety from many foes to their sociable habits.
Being nocturnal animals they are liable to the attacks of the
Jaguar, which will speedily overpower and devour a Peccary that
has strayed from, its herd,
Fossil Swine.—The existing genera of the Pig tribe are alsc
known in a fossil condition, Sus itself goes back as far as the
Upper Miocene. jSits erymantfoius, the Erymanthine Boar, M
known from beds of that age in Greece, England, and Germany,
This genus is not known to have had a wider distribution in the
past than it has in the present. Dicoiyles occurs in the Pleisto-
cene of both 3^"orth and South America, the regions which i1
inhabits at the present day. The genus Listriodon, also Miocene
is remarkable for having lophodont instead of bunodont teeth
that is so far as concerns the molars, which resemble those o
the Tapir. It was European and Indian in range. A numbei
of genera, more remote from, the existing Pigs than those whicl
have just been dealt with, are placed together in a speeia
sub-family, Aehaenodontinae. The type genus, ^Achaenodon, hac
a somewhat short skull for a Pig; and it is in general aspec
and in the characters of the canine teeth highly suggestive o
that of a Carnivore. The bunodont molars, however, are Suin€
as is the form of the lower jaw with a rounded angle. This i
an Eocene animal found in Wyoming.
JSlotJierivum * occurs chiefly in the Miocene of both iNortl
America and Europe; but JK. uintense is Eocene. The orbit
are completely encircled by bone in the more modern forms; thi
is not the case in the last-described genus, with which J£ wintens
agrees. The skull is also longer and more Pig-like. The a-ygo
matic arch is powerful, with sometimes a large descending process
such as is found in IMprotodon, more faintly in Kangaroos, and ii
Sloths and certain extinct Edentates. The lower jaw has a pai
1 Marsh, ^timer. Jawm. Sci. slyii. 1894, p. 407.